Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4fbcfb1f30c875…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 11:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3cb74786ea69ba96fcb6ebf79fd97c3a SHA-1: a90073369564b7cf3fa03bce6198528dca94b0a5 SHA-256: 2b4fbcfb1f30c8753ebea0d4fe67faa95e6f47af5c002b9e8a016ef18cb0a951
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, suggesting a link farm or phishing attempt. The presence of a 'download button' lure further supports a malicious intent to trick users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=slam+dunk+apk+offline PDF link annotation
    • http://k12kos.com/ckfinder/userfiles/files/suranesakofugikaxikalo.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210907040101.pdfIn PDF document text
    • https://tekartltd.com/upload/files/60445774828.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301c488d41f---guremekixagudezasekaj.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210908163112392458.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/8943425620.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/38092146757.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/27654374688.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/zepomifibesibur.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///wivomurowe.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/6226938373.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/velesupi.pdfIn PDF document text
    • http://yanartextil.com/firma/files/54500000484.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309627935f2---gedanokuvemolexu.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/damuwilakevasetox.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/zibafamamuraguvolo.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4s15u22spp0caseadgnm6dunl2/tevevekekalujelin.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mafiganenifikelibarap.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/xoxasuvarewiliwox.pdfIn PDF document text
    • http://samtekelektrik.com/files/lubukavozaverevev.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/49664248418.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/xanonikufi.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/vegexakezizoxilu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 10560 bytes
SHA-256: 9066c23f6f233ae155067ba047c2011363599e5d25a7d8c49ebd421311d2d911
font_01_sfnt_off0001014c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001195e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195E 18460 bytes
SHA-256: ab5f3b1d4057af469540642e2cf2cf36479197f1bed692579889ae09b1133eb8

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